JPH075805B2 - Stabilized halogen-containing resin composition - Google Patents

Description

The present invention relates to a halogen-containing resin composition having a high heat distortion temperature and a high degree of thermal stability.

Recently, OA equipment housings, building materials, packaging containers, pipes,
Plastic products used for joints and the like tend to be required to be light, thin, short and small. Vinyl chloride resins and polymer blend resins containing them are frequently used for these applications.

However, when the final product is made thin, it is likely to be deformed by heat. Therefore, a resin composition having a high heat distortion temperature is required, and at the time of processing, the resin composition can withstand a molding temperature higher than before. It must be profitable.

Deterioration prevention method by adding hydrotalcites or dibutyltin maleate acid neutralizing agent to vinyl chloride resin (Japanese Patent Laid-Open No. 55-80445), or organic of hydrotalcites or thioglycolic acid ester on vinyl chloride resin A method of stabilizing by adding a tin salt has been proposed (JP-A-57-209943). In the former method, the thermal stability is improved, and in the latter method, the thermal stability and the heat distortion temperature are both increased. Also, it is not possible to obtain a result that satisfies the above conditions.

As a result of research from the above viewpoint, the present inventors have obtained a halogen-containing resin composition having a high heat distortion temperature and a high degree of thermal stability by adding two specific types of organotin compounds to hydrotalcites. Was successful.

That is, the present invention is directed to (a)
A stabilized halogen-containing resin composition, comprising the addition of hydrotalcites, (b) dialkyltin malate polymer and (c) dialkyltin β7 mercaptopropionate polymer.

Examples of the hydrotalcites added to the halogen-containing resin in the present invention include those represented by the general formula (However, O <x ≦ 0.5, m is a positive number.) A hydrated double salt compound composed of magnesium and aluminum represented by the formula (2) may be used, and may be a natural product or a synthetic product.
These are commercially available. The addition amount of hydrotalcites is 0.01 to 5 parts by weight with respect to 100 parts by weight of the halogen-containing resin.

Two other particular organotin compounds added in the present invention are dialkyltin malate polymers and dialkyltin β-mercaptopropionate polymers. Examples of the dialkyltin maleate polymer include dimethyltin maleate polymer, dibutyltin maleate polymer, dioctyltin maleate polymer, didodecyltin maleate polymer, and the like, and examples of the dialkyltin β-mercaptopropionate polymer include Examples thereof include dimethyltin β-mercaptopropionate polymer, dibutyltin β-mercaptopropionate polymer, dioctyltin β-mercaptopropionate polymer and didodecyltin β-mercaptopropionate polymer. The addition ratio of these two kinds of organotin compounds is in the range of 10: 1 to 1:10, and the total addition amount is 0.05 to 5 parts by weight with respect to 100 parts by weight of the halogen-containing resin.

Examples of the halogen-containing resin stabilized by the present invention include vinyl halide homopolymers such as vinyl chloride resin, vinyl bromide resin and vinylidene chloride resin, and vinyl halides such as vinyl acetate, ethylene, propylene, styrene and isobutylene. , Copolymers such as those formed by polymerizing one or more comonomers such as vinylidene chloride, maleic anhydride, butadiene, isoprene, methyl methacrylate, acrylonitrile, dialkyl maleates and the like, post-chlorination Examples thereof include vinyl chloride resin. In addition, halogen-containing resin and acrylonitrile / butadiene / styrene resin, methyl methacrylate / butadiene / styrene resin, acrylonitrile / chlorinated polyethylene / styrene copolymer resin, acrylic rubber / acrylonitrile / styrene copolymer resin, acrylic rubber / methyl methacrylate / Examples thereof include acrylonitrile copolymer resin, vinyl acetate / ethylene copolymer resin, chlorinated polyethylene, and polymer blend resin with impact resistance improving resin such as chlorinated rubber.

For the halogen-containing resin composition of the present invention, known stabilizers such as metal organic acid salts, epoxy compounds, phenolic antioxidants, boric acid, boric anhydride, borate salts, boric anhydride, boric acid. Esters, organic phosphites and UV absorbers can be added. If necessary, pigments, fillers, lubricants, antistatic agents, flame retardants and processing aids can also be used.

According to the present invention, a resin composition obtained by adding a hydrotalcite compound and a specific two kinds of organotin compounds to a halogen-containing resin as a stabilizer has a high heat distortion temperature, and has a high thermal deformation temperature when processed at a high temperature. Since it exhibits excellent thermal stability, it can be used in fields requiring light, thin, short and small plastic products.

Next, the present invention will be described with reference to examples. In addition, the part in an Example shall show a weight part.

Example 1 Vinyl chloride resin (Geon 103EP-8, manufactured by Zeon Corporation) 100
2 parts of a mixture of hydrotalcite (DHT-4A, manufactured by Kyowa Chemical Industry Co., Ltd.) and an organic tin compound shown in Table 1 below were mixed and kneaded with a test roll at 170 ° C for 5 minutes, and then the thickness was 0.5 mm. Created a sheet of. After cutting each sheet into a size of 2 cm x 2 cm, it was put into a gear aging tester at 200 ° C and the decomposition time and colorability were examined.

The results are shown in Table 1.

Example 2 100 parts of vinyl chloride resin (Geon 103EP-8) was added to methyl methacrylate / butadiene / styrene resin (Kaneace B).
-12, manufactured by Kaneka Co., Ltd.), 3 parts of a mixture of hydrotalcite (Alkamizer I, manufactured by Kyowa Chemical Industry Co., Ltd.) and an organic tin compound shown in Table 2 below, and tested in the same manner as in Example 1. Then, the decomposition time and the coloring property were examined.

The results are shown in Table 2.

Example 3 50 parts of vinyl chloride resin (Geon 130EP-8), 50 parts of acrylonitrile butadiene styrene resin (Toyolac 100, manufactured by Toray), and hydrotalcite (Alkamizer II, manufactured by Kyowa Chemical Industry Co., Ltd.) shown in Table 3 below. 4) and 4 parts of a mixture of an organotin compound and tested in the same manner as in Example 1.
The decomposition time and colorability were investigated.

The results are shown in Table 3.

Example 4 50 parts of vinyl chloride resin (Geon 130EP-8) and 50 parts of acrylonitrile-butadiene-styrene resin (Toyolac 100)
Part, 3 parts of a mixture of hydrotalcite (DHT-4A) and an organic tin compound shown in Table 4 below were mixed, and the mixture was mixed with a test roll.
After kneading at 0 ° C for 5 minutes, a sheet having a thickness of 0.5 mm was prepared. Four sheets were put together and pressed at 180 ° C. for 10 minutes with a press machine, and this 2 mm thick press plate was subjected to a heating penetration test based on JIS K-6739 to examine the heat distortion temperature.

The results are shown in Table 4.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location C08L 33/00 LHR (56) References JP 54-71156 (JP, A) JP 57 -209943 (JP, A)

Claims (1)

[Claims] 1. To 100 parts by weight of a halogen-containing resin,
(A) Hydrotalcites 0.01 to 5 parts by weight and a mixture ratio of 10: 1 to 1:10 (b) dialkyl tin malate polymer and (c) dialkyl tin β-mercaptopropionate polymer mixture A stabilized halogen-containing resin composition, which comprises adding 0.05 to 5 parts by weight.